A long-lost emerald, a missing treasure map, and a wealthy villain combine for an action-packed adventure Thirteen-year-old Noah Winter, the son of sea-exploring treasure hunters, dives the San Isabel shipwreck with his parents in search of a mysterious treasure map lost in the murky depths off the Florida Keys over a century ago. The map reveals the hiding place of the priceless De La Rosa emerald. But before the Winters can find the map, a wealthy treasure-hunting rival kidnaps Noah's parents. Now Noah must match wits with a dangerous adversary, not only to discover the treasure map first, but to rescue his mom and dad before it's too late.